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index.js
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Wed, Jan 15, 07:34

index.js
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
// TODO(sven): add flow in here
import { isSignature, isNumberLiteral } from "@webassemblyjs/ast";
export function moduleContextFromModuleAST(m) {
var moduleContext = new ModuleContext();
if (!(m.type === "Module")) {
throw new Error('m.type === "Module"' + " error: " + (undefined || "unknown"));
}
m.fields.forEach(function (field) {
switch (field.type) {
case "Start":
{
moduleContext.setStart(field.index);
break;
}
case "TypeInstruction":
{
moduleContext.addType(field);
break;
}
case "Func":
{
moduleContext.addFunction(field);
break;
}
case "Global":
{
moduleContext.defineGlobal(field);
break;
}
case "ModuleImport":
{
switch (field.descr.type) {
case "GlobalType":
{
moduleContext.importGlobal(field.descr.valtype, field.descr.mutability);
break;
}
case "Memory":
{
moduleContext.addMemory(field.descr.limits.min, field.descr.limits.max);
break;
}
case "FuncImportDescr":
{
moduleContext.importFunction(field.descr);
break;
}
case "Table":
{
// FIXME(sven): not implemented yet
break;
}
default:
throw new Error("Unsupported ModuleImport of type " + JSON.stringify(field.descr.type));
}
break;
}
case "Memory":
{
moduleContext.addMemory(field.limits.min, field.limits.max);
break;
}
}
});
return moduleContext;
}
/**
* Module context for type checking
*/
export var ModuleContext =
/*#__PURE__*/
function () {
function ModuleContext() {
_classCallCheck(this, ModuleContext);
this.funcs = [];
this.funcsOffsetByIdentifier = [];
this.types = [];
this.globals = [];
this.globalsOffsetByIdentifier = [];
this.mems = []; // Current stack frame
this.locals = [];
this.labels = [];
this.return = [];
this.debugName = "unknown";
this.start = null;
}
/**
* Set start segment
*/
_createClass(ModuleContext, [{
key: "setStart",
value: function setStart(index) {
this.start = index.value;
}
/**
* Get start function
*/
}, {
key: "getStart",
value: function getStart() {
return this.start;
}
/**
* Reset the active stack frame
*/
}, {
key: "newContext",
value: function newContext(debugName, expectedResult) {
this.locals = [];
this.labels = [expectedResult];
this.return = expectedResult;
this.debugName = debugName;
}
/**
* Functions
*/
}, {
key: "addFunction",
value: function addFunction(func
/*: Func*/
) {
// eslint-disable-next-line prefer-const
var _ref = func.signature || {},
_ref$params = _ref.params,
args = _ref$params === void 0 ? [] : _ref$params,
_ref$results = _ref.results,
result = _ref$results === void 0 ? [] : _ref$results;
args = args.map(function (arg) {
return arg.valtype;
});
this.funcs.push({
args: args,
result: result
});
if (typeof func.name !== "undefined") {
this.funcsOffsetByIdentifier[func.name.value] = this.funcs.length - 1;
}
}
}, {
key: "importFunction",
value: function importFunction(funcimport) {
if (isSignature(funcimport.signature)) {
// eslint-disable-next-line prefer-const
var _funcimport$signature = funcimport.signature,
args = _funcimport$signature.params,
result = _funcimport$signature.results;
args = args.map(function (arg) {
return arg.valtype;
});
this.funcs.push({
args: args,
result: result
});
} else {
if (!isNumberLiteral(funcimport.signature)) {
throw new Error('isNumberLiteral(funcimport.signature)' + " error: " + (undefined || "unknown"));
}
var typeId = funcimport.signature.value;
if (!this.hasType(typeId)) {
throw new Error('this.hasType(typeId)' + " error: " + (undefined || "unknown"));
}
var signature = this.getType(typeId);
this.funcs.push({
args: signature.params.map(function (arg) {
return arg.valtype;
}),
result: signature.results
});
}
if (typeof funcimport.id !== "undefined") {
// imports are first, we can assume their index in the array
this.funcsOffsetByIdentifier[funcimport.id.value] = this.funcs.length - 1;
}
}
}, {
key: "hasFunction",
value: function hasFunction(index) {
return typeof this.getFunction(index) !== "undefined";
}
}, {
key: "getFunction",
value: function getFunction(index) {
if (typeof index !== "number") {
throw new Error("getFunction only supported for number index");
}
return this.funcs[index];
}
}, {
key: "getFunctionOffsetByIdentifier",
value: function getFunctionOffsetByIdentifier(name) {
if (!(typeof name === "string")) {
throw new Error('typeof name === "string"' + " error: " + (undefined || "unknown"));
}
return this.funcsOffsetByIdentifier[name];
}
/**
* Labels
*/
}, {
key: "addLabel",
value: function addLabel(result) {
this.labels.unshift(result);
}
}, {
key: "hasLabel",
value: function hasLabel(index) {
return this.labels.length > index && index >= 0;
}
}, {
key: "getLabel",
value: function getLabel(index) {
return this.labels[index];
}
}, {
key: "popLabel",
value: function popLabel() {
this.labels.shift();
}
/**
* Locals
*/
}, {
key: "hasLocal",
value: function hasLocal(index) {
return typeof this.getLocal(index) !== "undefined";
}
}, {
key: "getLocal",
value: function getLocal(index) {
return this.locals[index];
}
}, {
key: "addLocal",
value: function addLocal(type) {
this.locals.push(type);
}
/**
* Types
*/
}, {
key: "addType",
value: function addType(type) {
if (!(type.functype.type === "Signature")) {
throw new Error('type.functype.type === "Signature"' + " error: " + (undefined || "unknown"));
}
this.types.push(type.functype);
}
}, {
key: "hasType",
value: function hasType(index) {
return this.types[index] !== undefined;
}
}, {
key: "getType",
value: function getType(index) {
return this.types[index];
}
/**
* Globals
*/
}, {
key: "hasGlobal",
value: function hasGlobal(index) {
return this.globals.length > index && index >= 0;
}
}, {
key: "getGlobal",
value: function getGlobal(index) {
return this.globals[index].type;
}
}, {
key: "getGlobalOffsetByIdentifier",
value: function getGlobalOffsetByIdentifier(name) {
if (!(typeof name === "string")) {
throw new Error('typeof name === "string"' + " error: " + (undefined || "unknown"));
}
return this.globalsOffsetByIdentifier[name];
}
}, {
key: "defineGlobal",
value: function defineGlobal(global
/*: Global*/
) {
var type = global.globalType.valtype;
var mutability = global.globalType.mutability;
this.globals.push({
type: type,
mutability: mutability
});
if (typeof global.name !== "undefined") {
this.globalsOffsetByIdentifier[global.name.value] = this.globals.length - 1;
}
}
}, {
key: "importGlobal",
value: function importGlobal(type, mutability) {
this.globals.push({
type: type,
mutability: mutability
});
}
}, {
key: "isMutableGlobal",
value: function isMutableGlobal(index) {
return this.globals[index].mutability === "var";
}
}, {
key: "isImmutableGlobal",
value: function isImmutableGlobal(index) {
return this.globals[index].mutability === "const";
}
/**
* Memories
*/
}, {
key: "hasMemory",
value: function hasMemory(index) {
return this.mems.length > index && index >= 0;
}
}, {
key: "addMemory",
value: function addMemory(min, max) {
this.mems.push({
min: min,
max: max
});
}
}, {
key: "getMemory",
value: function getMemory(index) {
return this.mems[index];
}
}]);
return ModuleContext;
}();

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